Factitious Disorders in Neurology: An Analysis of Reported Cases

Misdiagnosis of functional neurological symptom disorders in paediatrics: Narrative review and relevant case report

Functional neurological symptom disorders (FNSD) pose a common challenge in clinical practice, particularly in pediatric cases where the clinical phenotypes can be intricate and easily confused with structural disturbances. The frequent coexistence of FNSDs with other medical disorders often results in misdiagnosis. In this review, we highlight the distinctions between FNSD and various psychiatric and neurological conditions. Contrary to the misconception that FNSD is a diagnosis of exclusion, we underscore its nature as a diagnosis of inclusion, contingent upon recognizing specific clinical features. However, our focus is on a critical learning point illustrated by the case of a 14-year-old male initially diagnosed with FNSD, but subsequently found to have a rare primary monogenic movement disorder (paroxysmal kinesigenic dyskinesia, PKD). The crucial takeaway from this case is the importance of avoiding an FNSD diagnosis based solely on psychiatric comorbidity and suppressible symptoms. Instead, clinicians should diligently assess for specific features indicative of FNSD, which were absent in this case. This emphasizes the importance of making a diagnosis of inclusion. Extended follow-up and clinical-oriented genetic testing might help identify comorbidities, prevent misdiagnosis, and guide interventions in complex cases, which cannot be simply classified as "functional" solely because other conditions can be excluded.

[Factitious disorder imposed on self and Munchausen syndrome: An update]

Factitious disorder imposed on self (FDIS) is a mental disorder characterized by conscious manipulative behavior from patients with no clearly identifiable external objective. It affects subjects with a wide range of characteristics, only some of whom fit the stereotypical profile of the young female working in the health sector. It can take the form of a variety of symptoms or clinical signs, and is likely to involve all specialties. Munchausen syndrome is a particular form of FDIS, more prevalent in men and marked by its severity. Psychiatric comorbidities are common in patients with FDIS. Death is rare but possible, either as a result of the disease itself, complications of examinations or treatments, or suicide. The diagnostic approach must seek to identify positive arguments in favor of the disorder. Diagnosis by elimination remains possible when no other hypothesis can explain a clinical picture suggestive of FDIS. The prognosis is often poor, at least in the short and medium term. Avoiding unnecessary prescriptions is essential to prevent iatrogenesis. The management of FDIS is poorly codified. In all cases, the practitioner must adopt a non-aggressive, empathetic attitude.

Incidence of the diagnosis of factitious disorders - Nationwide comparison study between Germany and Norway

Factitious disorders (FD) like Munchausen syndrome are well known to most physicians, yet the corresponding ICD-10 diagnosis F68.1 remains severely under-assigned and often misdiagnosed. To approach this problem, we conducted a nationwide inquiry for Germany and Norway as well as a comparison between these two countries regarding the incidence of diagnosis of FD. The assignment rates of F68.1 in somatic hospitals from 2008 to 2016 were analyzed based on the Diagnosis Related Groups statistic from the German Federal Statistical Office and the data provided from the Norwegian Patient Registry. The Norwegian data also included information on individual patients whereas the German data only contained the total number of F68.1 assignment due to strict medical confidentiality laws. The incidence of the diagnosis of FD in Germany and Norway showed similar assignment rates with 3.71 and 3.18 per 100,000, respectively. The mean age was 39.4 years for German patients and 35.6 years for Norwegian patients. The gender distribution was almost equal for the individual patients’ rate (49% female and 51% male). Furthermore, our results indicate that female patients with FD tend to demand healthcare services more frequently than male patients. Smaller studies focusing on the diagnosis of FD have significantly higher assignment rates compared to nationwide inquiries. Our results illustrate substantial differences between estimations of the incidence of FD and the need for further studies. Besides the many obstacles associated with diagnosis of FD, strict medical confidentiality laws prevent reliable and scientific investigations of this matter.

Triparesis: an unusual presentation of factitious disorder

Factitious disorder (FD) has diverse presentations but neurological presentation is unusual. In this report, we discuss a case of FD who presented with triparesis, that is, weakness of both lower limbs and right upper limb. Diagnosis of FD was made after detailed clinical evaluation, review of past medical records that revealed extensive evaluation to rule out physical illness, and inability to find any associated stressful event or material gain associated with illness. Management was largely supportive and was based on psychotherapy. Identification of FD depends on a high index of suspicion by the physician and the presence of atypical and medically unexplainable signs/symptoms.

[Factitious disorders]

Patients with factitious disorders intentionally fabricate, exaggerate or feign physical and/or psychiatric symptoms for various open and covert psychological reasons. There are many issues regarding the diagnostic state and classification of factitious disorders. Both the categorical differentiation of and clinical continuum ranging from somatoform/dissociative disorders to malingering are being controversially debated. Epidemiological studies on the frequency of factitious disorder meet basic methodological difficulties. Reported rates of prevalence and incidence in the professional literature most probably have to be considered underestimations. Illness deception and self-harm as core features of the abnormal illness behaviour in factitious disorder may refer to various highly adverse and traumatic experiences during early development in a subgroup of patients. Chronic courses of illness prevail; however, there are also episodic variants.

Factitious disorder: a systematic review of 455 cases in the professional literature

OBJECTIVE

Patients with factitious disorder (FD) fabricate illness, injury or impairment for psychological reasons and, as a result, misapply medical resources. The demographic and clinical profile of these patients has yet to be described in a sufficiently large sample, which has prevented clinicians from adopting an evidence-based approach to FD. The present study aimed to address this issue through a systematic review of cases reported in the professional literature.

METHOD

A systematic search for case studies in the MEDLINE, Web of Science and EMBASE databases was conducted. A total of 4092 records were screened and 684 remaining papers were reviewed. A supplementary search was conducted via GoogleScholar, reference lists of eligible articles and key review papers. In total, 372 eligible studies yielded a sample of 455 cases. Information extracted included age, gender, reported occupation, comorbid psychopathology, presenting signs and symptoms, severity and factors leading to the diagnosis of FD.

RESULTS

A total of 66.2% of patients in our sample were female. Mean age at presentation was 34.2 years. A healthcare or laboratory profession was reported most frequently (N=122). A current or past diagnosis of depression was described more frequently than personality disorder in cases reporting psychiatric comorbidity (41.8% versus 16.5%) and more patients elected to self-induce illness or injury (58.7%) than simulate or falsely report it. Patients were most likely to present with endocrinological, cardiological and dermatological problems. Differences among specialties were observed on demographic factors, severity and factors leading to diagnosis of FD.

CONCLUSIONS

Based on the largest sample of patients with FD analyzed to date, our findings offer an important first step toward an evidence-based approach to the disorder. Future guidelines must be sensitive to differing methods used by specialists when diagnosing FD.

Factitious disorders and malingering in relation to functional neurologic disorders

Interest in malingering has grown in recent years, and is reflected in the exponential increase in academic publications since 1990. Although malingering is more commonly detected in medicolegal practice, it is not an all-or-nothing presentation and moreover can vary in the extent of presentation. As a nonmedical disorder, the challenge for clinical practice remains that malingering by definition is intentional and deliberate. As such, clinical skills alone are often insufficient to detect it and we describe psychometric tests such as symptom validity tests and relevant nonmedical investigations. Finally, we describe those areas of neurologic practice where symptom exaggeration and deception are more likely to occur, e.g., postconcussional syndrome, psychogenic nonepileptic seizures, motor weakness and movement disorders, and chronic pain. Factitious disorders are rare in clinical practice and their detection depends largely on the level of clinical suspicion supported by the systematic collection of relevant information from a variety of sources. In this chapter we challenge the accepted DSM-5 definition of factitious disorder and suggest that the traditional glossaries have neglected the extent to which a person's reported symptoms can be considered a product of intentional choice or selective psychopathology largely beyond the subject's voluntary control, or more likely, both. We present evidence to suggest that neurologists preferentially diagnose factitious presentations in healthcare workers as "hysterical," possibly to avoid the stigma of simulated illness.

When the lie is the truth: grounded theory analysis of an online support group for factitious disorder

Factitious disorder (FD) is poorly understood because of the elusiveness of sufferers. What is known is based on speculation from observational case studies and this is evident by the manifold diagnostic and treatment issues associated with FD. This study sought to fill the gap in the literature and overcome the elusiveness of FD sufferers by analysing their text communications in two online communities. One hundred twenty four posts by 57 members amounting to approximately 38,000 words were analysed using grounded theory. The analysis showed that contrary to current theories of FD, motivation is conscious and not unconscious, members did experience symptoms associated with the disorder, and they were also upset by their behaviour and wanted to recover but were deterred by fear. Furthermore, using the excessive appetitive model by Orford (2001) it is hypothesised that the characteristics of FD described by the members were congruent with those associated with addiction.

Specialist inpatient treatment for severe motor conversion disorder: a retrospective comparative study

BACKGROUND

Gold standard protocols have yet to be established for the treatment of motor conversion disorder (MCD). There is limited evidence to support inpatient, multidisciplinary intervention in chronic, severe cases.

AIMS

To evaluate the characteristics and outcomes of MCD patients admitted to a specialist neuropsychiatric inpatient unit.

METHODS

All patients admitted to the Lishman Unit (years 2007-2011) with a diagnosis of MCD were included. Data relevant to characteristics and status with regard to mobility, activities of daily living (ADLs) and Modified Rankin Scale (MRS) score at admission and discharge were extracted.

RESULTS

Thirty-three cases (78.8% female) were included; the median duration of illness was 48 months. In comparison with brain injury patients admitted to the same unit, more cases had histories of childhood sexual abuse (36.4%, n=12), premorbid non-dissociative mental illness (81.1%, n=27) and employment as a healthcare/social-care worker (45.5%, n=15). Cases showed significant improvements in MRS scores (p<0.001), mobility (p<0.001) and ADL (p=0.002) following inpatient treatment.

CONCLUSIONS

Patients with severe, long-standing MCD can achieve significant improvements in functioning after admission to a neuropsychiatry unit.

["Factitious disorder and skin picking: Clinical approach". A case report]

OBJECTIVE

The number of patients requiring primary and secondary care for factitious disorder unexplained by any known medical condition is high. We report a case illustrating the clinical and psychopathological features of factitious disorder. The treatment difficulties encountered in the association of this disorder with dermatillomania are discussed.

CASE REPORT

The patient was a 22-year old girl with abrasions on the face and forearms with ingested epidermal layer of the skin. She also had multiple somatic complaints, the authenticity of which was difficult to confirm. The diagnosis of comorbid factitious disorder with dermatillomania was retained. In view of reducing self-harm acts, we prescribed a mood stabilizer associated with an anxiolytic for 6 months. The self-harming acts have regressed, while the hypochondriacal complaints remain with a tendency of overstatement.

DISCUSSION

Factitious disorder (FD) is a mental disorder occurring in patients acting intentionally similar to a physically or mentally sick person with no apparent benefits. The reported cases often show FD comorbidity with other psychiatric disorders such as substance abuse, somatoform disorders, dysthymia, borderline personality disorder and sexual disorders. Comorbidity of factitious disorder with neurotic excoriation is exceptional, and rarely described in the literature. Pathological skin picking (PSP) is a disabling disorder characterized by repetitive skin picking, which causes tissue damage. It was estimated to affect 2% of the population. PSP is currently listed as an impulse control disorder not otherwise specified, it is associated with a high rate of psychiatric comorbidity like borderline personality disorder.

CONCLUSION

The comorbidity of factitious disorder and dermatillomania makes diagnosis very difficult. The limit between the two disorders is sometimes unclear.

The origins of factitious disorder

Factitious disorder is the deliberate simulation of illness for the purpose of seeking the sick role. It is a 20th-century diagnosis, though the grounds for its introduction are uncertain. While previous authors have considered the social changes contributing to growth in the disorder, this article looks at some of the pressures on doctors that may have created the diagnostic need for a disorder between hysteria and malingering. The recent history of those disorders suggests that malingering would no longer be acceptable when applied to the potentially larger numbers involved in workers' compensation or in mass conscription. Equally, the absolution given to hysteria on the basis of the Freudian subconscious would survive only as long as that model retained credibility. Growing egalitarianism and changing doctor-patient relationships in the 20th century would no longer tolerate a sharp division between culpable malingering and exculpated hysteria, which may previously have been made on grounds of class or gender. They would contribute to the need for a mediating diagnosis, such as factitious disorder.